Grimrock is an oldschool dungeon crawl in the truest sense. There is (automap aside) no concession to modern gaming sensibilities. Yes, that means you have to click for each attack and spells are cast by clicking multiple runes. So when you don't like clicking a lot, better don't take a mage. There are no healing spells. Your best shot for survival is preventing damage and the odd healing potion. Healing potions have to be crafted via alchemy, they don't just lie around.